From what I understand, Dunlop's leather grip will add approximately 10 grams over a synthetic, roughly .3oz. So the Bio Max 200 with the standard synthetic of the regular Bio. 300, hypothetically speaking, comes in at roughly 11.5oz., by comparison. That's .6-.7oz. heavier than the stock Bio. 300. It doesn't sound like you have nearly that much at 3/9, so I'd bet this new Bio Max 200 will play even bigger than you currently have.
I hit the 300G for almost five years with 8-10 grams at 3/9, 2 layers of head tape covering the bumper, 14 grams inside the butt cap, and an overgrip. They spec'd out at 11.8oz., 5-6pts. hl, and unknown swingweight, but I'm guessing 320ish. Therefore, I can't deny that this one is calling me home, and I'm resisting the temptation daily to preorder.
I'm very interested as well for anyone who has any other initial reviews on this one, besides those given my JGads and AO. The beauty of a Dunlop 300 is the ability to roll the ball into the court with ample spin but also the ability to step into the court and drive the ball flat with surgical precision. As long as I can do the latter, it'll probably be my next frame at some point. Without even touching it, I have a good idea of how well it will perform at net and on serve.